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https://github.com/Z3Prover/z3
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remove unused code
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner
parent
fadcac8f6d
commit
c7063631e1
4 changed files with 0 additions and 346 deletions
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@ -2,7 +2,6 @@ z3_add_component(opt
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SOURCES
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maxres.cpp
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maxsmt.cpp
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mss.cpp
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opt_cmds.cpp
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opt_context.cpp
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opt_pareto.cpp
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@ -57,7 +57,6 @@ Notes:
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#include "opt/maxres.h"
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#include "ast/ast_pp.h"
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#include "solver/mus.h"
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#include "opt/mss.h"
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#include "sat/sat_solver/inc_sat_solver.h"
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#include "opt/opt_context.h"
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#include "ast/pb_decl_plugin.h"
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@ -90,7 +89,6 @@ private:
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obj_map<expr, rational> m_asm2weight;
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ptr_vector<expr> m_new_core;
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mus m_mus;
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mss m_mss;
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expr_ref_vector m_trail;
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strategy_t m_st;
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rational m_max_upper;
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@ -121,7 +119,6 @@ public:
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m_index(index),
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m_B(m), m_asms(m), m_defs(m),
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m_mus(c.get_solver()),
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m_mss(c.get_solver(), m),
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m_trail(m),
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m_st(st),
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m_correction_set_size(0),
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285
src/opt/mss.cpp
285
src/opt/mss.cpp
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@ -1,285 +0,0 @@
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/*++
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Copyright (c) 2014 Microsoft Corporation
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Module Name:
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mss.cpp
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Abstract:
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MSS/MCS extraction.
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Author:
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Nikolaj Bjorner (nbjorner) 2014-2-8
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Notes:
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--*/
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#include "solver/solver.h"
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#include "opt/mss.h"
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#include "ast/ast_pp.h"
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#include "model/model_smt2_pp.h"
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namespace opt {
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mss::mss(solver& s, ast_manager& m): m_s(s), m(m) {
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}
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mss::~mss() {
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}
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bool mss::check_result() {
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lbool is_sat = m_s.check_sat(m_mss.size(), m_mss.c_ptr());
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if (is_sat == l_undef) return true;
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SASSERT(m_mss.empty() || is_sat == l_true);
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if (is_sat == l_false) return false;
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expr_set::iterator it = m_mcs.begin(), end = m_mcs.end();
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for (; it != end; ++it) {
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m_mss.push_back(*it);
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is_sat = m_s.check_sat(m_mss.size(), m_mss.c_ptr());
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m_mss.pop_back();
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if (is_sat == l_undef) return true;
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SASSERT(is_sat == l_false);
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if (is_sat == l_true) return false;
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}
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return true;
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}
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void mss::initialize(exprs& literals) {
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expr* n;
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expr_set lits, core_lits;
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for (unsigned i = 0; i < literals.size(); ++i) {
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n = literals[i];
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lits.insert(n);
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m.is_not(n, n);
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if (!is_uninterp_const(n)) {
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throw default_exception("arguments have to be uninterpreted literals");
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}
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}
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exprs rest_core;
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expr_ref tmp(m);
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//
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// the last core is a dummy core. It contains literals that
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// did not occur in previous cores and did not evaluate to true
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// in the current model.
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//
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for (unsigned i = 0; i < m_cores.size(); ++i) {
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exprs const& core = m_cores[i];
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for (unsigned j = 0; j < core.size(); ++j) {
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expr* n = core[j];
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if (!core_lits.contains(n)) {
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core_lits.insert(n);
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if (m_model->eval(n, tmp) && m.is_true(tmp)) {
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add_mss(n);
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}
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else {
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m_todo.push_back(n);
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}
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}
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}
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}
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for (unsigned i = 0; i < literals.size(); ++i) {
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expr* n = literals[i];
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if (!core_lits.contains(n)) {
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if (m_model->eval(n, tmp) && m.is_true(tmp)) {
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m_mss.push_back(n);
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}
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else {
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rest_core.push_back(n);
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core_lits.insert(n);
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m_todo.push_back(n);
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}
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}
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}
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m_cores.push_back(rest_core);
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}
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void mss::add_mss(expr* n) {
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if (!m_mss_set.contains(n)) {
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m_mss_set.insert(n);
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m_mss.push_back(n);
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}
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}
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void mss::update_core(exprs& core) {
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unsigned j = 0;
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for (unsigned i = 0; i < core.size(); ++i) {
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expr* n = core[i];
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if (!m_mss_set.contains(n)) {
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if (i != j) {
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core[j] = core[i];
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}
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++j;
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}
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}
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core.resize(j);
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}
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void mss::update_mss() {
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expr_ref tmp(m);
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unsigned j = 0;
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for (unsigned i = 0; i < m_todo.size(); ++i) {
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expr* n = m_todo[i];
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SASSERT(!m_mss_set.contains(n));
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if (m_mcs.contains(n)) {
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continue; // remove from cores.
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}
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if (m_model->eval(n, tmp) && m.is_true(tmp)) {
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add_mss(n);
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}
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else {
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if (j != i) {
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m_todo[j] = m_todo[i];
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}
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++j;
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}
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}
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m_todo.resize(j);
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}
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lbool mss::operator()(model* initial_model, vector<exprs> const& _cores, exprs& literals, exprs& mcs) {
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m_mss.reset();
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m_todo.reset();
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m_model = initial_model;
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m_cores.reset();
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SASSERT(m_model);
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m_cores.append(_cores);
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initialize(literals);
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TRACE("opt",
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display_vec(tout << "lits: ", literals.size(), literals.c_ptr());
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display(tout););
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lbool is_sat = l_true;
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for (unsigned i = 0; is_sat == l_true && i < m_cores.size(); ++i) {
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bool has_mcs = false;
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bool is_last = i + 1 < m_cores.size();
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SASSERT(check_invariant());
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update_core(m_cores[i]); // remove members of mss
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is_sat = process_core(1, m_cores[i], has_mcs, is_last);
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}
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if (is_sat == l_true) {
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SASSERT(check_invariant());
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TRACE("opt", display(tout););
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literals.reset();
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literals.append(m_mss);
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mcs.reset();
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expr_set::iterator it = m_mcs.begin(), end = m_mcs.end();
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for (; it != end; ++it) {
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mcs.push_back(*it);
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}
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SASSERT(check_result());
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}
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m_mcs.reset();
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m_mss_set.reset();
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IF_VERBOSE(2, display_vec(verbose_stream() << "mcs: ", mcs.size(), mcs.c_ptr()););
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return is_sat;
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}
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//
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// at least one literal in core is false in current model.
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// pick literals in core that are not yet in mss.
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//
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lbool mss::process_core(unsigned sz, exprs& core, bool& has_mcs, bool is_last) {
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SASSERT(sz > 0);
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if (core.empty()) {
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return l_true;
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}
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if (m.canceled()) {
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return l_undef;
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}
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if (sz == 1 && core.size() == 1 && is_last && !has_mcs) {
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// there has to be at least one false
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// literal in the core.
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TRACE("opt", tout << "mcs: " << mk_pp(core[0], m) << "\n";);
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m_mcs.insert(core[0]);
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return l_true;
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}
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sz = std::min(sz, core.size());
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TRACE("opt", display_vec(tout << "process (total " << core.size() << ") :", sz, core.c_ptr()););
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unsigned sz_save = m_mss.size();
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m_mss.append(sz, core.c_ptr());
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lbool is_sat = m_s.check_sat(m_mss.size(), m_mss.c_ptr());
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IF_VERBOSE(3, display_vec(verbose_stream() << "mss: ", m_mss.size(), m_mss.c_ptr()););
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m_mss.resize(sz_save);
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switch (is_sat) {
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case l_true:
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m_s.get_model(m_model);
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update_mss();
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DEBUG_CODE(
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for (unsigned i = 0; i < sz; ++i) {
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SASSERT(m_mss_set.contains(core[i]));
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});
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update_core(core);
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return process_core(2*sz, core, has_mcs, is_last);
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case l_false:
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if (sz == 1) {
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has_mcs = true;
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m_mcs.insert(core[0]);
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core[0] = core.back();
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core.pop_back();
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}
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else {
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exprs core2;
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core2.append(core.size()-sz, core.c_ptr()+sz);
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core.resize(sz);
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is_sat = process_core(sz, core2, has_mcs, false);
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if (is_sat != l_true) {
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return is_sat;
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}
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update_core(core);
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}
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return process_core(1, core, has_mcs, is_last);
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case l_undef:
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return l_undef;
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}
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return l_true;
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}
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void mss::display_vec(std::ostream& out, unsigned sz, expr* const* args) const {
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for (unsigned i = 0; i < sz; ++i) {
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out << mk_pp(args[i], m) << " ";
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}
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out << "\n";
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}
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void mss::display(std::ostream& out) const {
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for (unsigned i = 0; i < m_cores.size(); ++i) {
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display_vec(out << "core: ", m_cores[i].size(), m_cores[i].c_ptr());
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}
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expr_set::iterator it = m_mcs.begin(), end = m_mcs.end();
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out << "mcs:\n";
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for (; it != end; ++it) {
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out << mk_pp(*it, m) << "\n";
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}
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out << "\n";
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out << "mss:\n";
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for (unsigned i = 0; i < m_mss.size(); ++i) {
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out << mk_pp(m_mss[i], m) << "\n";
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}
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out << "\n";
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if (m_model) {
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model_smt2_pp(out, m, *(m_model.get()), 0);
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}
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}
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bool mss::check_invariant() const {
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if (!m_model) return true;
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expr_ref tmp(m);
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for (unsigned i = 0; i < m_mss.size(); ++i) {
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expr* n = m_mss[i];
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if (!m_model->eval(n, tmp)) return true;
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CTRACE("opt", !m.is_true(tmp), tout << mk_pp(n, m) << " |-> " << mk_pp(tmp, m) << "\n";);
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SASSERT(!m.is_false(tmp));
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}
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return true;
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}
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}
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@ -1,57 +0,0 @@
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/*++
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Copyright (c) 2014 Microsoft Corporation
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Module Name:
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mss.h
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Abstract:
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Maximal satisfying subset/minimal correction sets: MSS/MCS
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Author:
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Nikolaj Bjorner (nbjorner) 2014-2-8
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Notes:
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--*/
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#ifndef MSS_H_
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#define MSS_H_
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namespace opt {
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class mss {
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solver& m_s;
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ast_manager& m;
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typedef ptr_vector<expr> exprs;
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typedef obj_hashtable<expr> expr_set;
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exprs m_mss;
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expr_set m_mcs;
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expr_set m_mss_set;
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vector<exprs> m_cores;
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exprs m_todo;
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model_ref m_model;
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public:
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mss(solver& s, ast_manager& m);
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~mss();
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lbool operator()(model* initial_model, vector<exprs> const& cores, exprs& literals, exprs& mcs);
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void get_model(model_ref& mdl) { mdl = m_model; }
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private:
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void initialize(exprs& literals);
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bool check_result();
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void add_mss(expr* n);
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void update_mss();
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void update_core(exprs& core);
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lbool process_core(unsigned sz, exprs& core, bool& has_mcs, bool is_last);
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void display(std::ostream& out) const;
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void display_vec(std::ostream& out, unsigned sz, expr* const* args) const;
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bool check_invariant() const;
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};
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};
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#endif
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